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John Legend is celebrating the big 4-0 on Friday, Dec. 28. Take a look back at his relationship with wife Chrissy Teigen through the years, including this recent shot of the glowing couple taking their older kiddo, Luna, to see Disney on Ice. Ari Perilstein/Getty Images for Feld Entertainment, Inc.

To get into the holiday spirit (and to promote John's new album) Legend and Teigen co-hosted a special variety show in December, titled "A Legendary Christmas with John and Chrissy." Paul Drinkwater/NBC

Legend kisses Teigen -- pregnant with their second baby!-- at City Harvest's 35th Anniversary Gala in April 2018. They welcomed baby No. 2, Miles Theodore Stephens, the next month. BRYAN BEDDER/GETTY IMAGES FOR CITY HARVEST

Take them out to the ball game! John, Chrissy and their firstborn Luna waved as they walked onto the field before the family threw out the ceremonial first pitch at a Seattle Mariners game in June 2017. ELAINE THOMPSON/AP

John Legend, Chrissy Teigen, Kim Kardashian and Kanye West attended a birthday party for John Legend (who was also celebrating the 10th anniversary of his debut album "Get Lifted") at CATCH NYC on Jan. 8. Dimitrios Kambouris, Getty Images for EMM Group